Malicious PDF — malware analysis report

Static analysis result for SHA-256 f95c7a1661ad0c47…

MALICIOUS

PDF

82.5 KB Created: 2021-09-13 18:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1bac9adad9193904b94036f80e532bb4 SHA-1: 841e867a2f1c5c98271b988ed560ece9faf57ac4 SHA-256: f95c7a1661ad0c47ae3df2d97c782cddc5dfd950d427c0373e45334b4e272416
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which appear to be compromised or disposable hosting. A critical heuristic identified a 'Clipboard command execution lure,' indicating the document instructs users to copy and paste content into a shell. This strongly suggests the document is designed to trick users into executing malicious commands, likely to download and run a secondary payload. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://smidgel.ru/uplcv?utm_term=how+to+push+files+using+adb PDF link annotation
    • http://ggmtc.net/userfiles/files/nesabuxuwivez.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b61f6ac45f---jevumifatuvomoj.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/jejebupinedosulusevaxa.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/83963475947.pdfIn PDF document text
    • https://renault-service.com/userfiles/2278823554.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/maripaguterevizotudez.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/14267128239.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/sivodorudomumaseb.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/50989518012.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/tobajitetujexu.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/47529626022.pdfIn PDF document text
    • http://sbairs.com/datas/files/nidowiwizagobegi.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/bosumudexenomesejoweto.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/juvenume.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/tiduni.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/miwiruli.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/runonilejoradixota.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea628e8d2f---57434332007.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/sutuwenemofavasakowa.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/33806755370.pdfIn PDF document text
    • http://sbairs.com/datas/files/sebuzilalirijaxidabobeve.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613792877277c---bopabo.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/bdec8be7f73044bea757e11bd10c1925/88723663252.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/nikamowesamefop.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF375 18356 bytes
SHA-256: 412cbf9d098446de593ef68889e106217afddb69f5da3d1f3f15d7ec5892b908
font_02_sfnt_off00012319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12319 10992 bytes
SHA-256: dfdaeccfd43b396548747d446ddb3aa0308c25eeeb13a430560b8f4351859661

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